Perhaps you should try some spelling variations:
e litterature » et litterature, de litterature, en litterature
studies lab » studies land, studies late, studies lead
filosofia e » filosofia de, filosofia del
test scale » tests scale, best scale, rest scale
studies la » studies lca, studies lia, studies l2

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: test scale ((studies la) OR (studies lab)) filosofia e litterature.
• Adding a wildcard symbol may retrieve word variants: test scale ((studies la) or (studies lab)) filosofia e litterature*.